The dump from 1/6 indicates a problem with the nvidia video
driver, and the one from 1/4 indicates a hardware problem:
Code:
===============================================================================
Section 2 : x86/x64 MCA
-------------------------------------------------------------------------------
Descriptor @ fffffa8005b60138
Section @ fffffa8005b60280
Offset : 600
Length : 264
Flags : 0x00000000
Severity : Fatal
Error : Unknown (Proc 0 Bank 2)
Status : 0xb200000000010005
Given the WHEA error was "unknown" (that is *really* rare), that makes this a bit of a trial-and-error situation. I'd start with completely uninstalling the nvidia video
driver, rebooting, and reinstalling, and if that doesn't help you'd want to swap out the video card with a known-good one as a test, and/or testing RAM to make sure it passes without errors (and probably in that order).